The human body is a living machine, and, like all machines, it needs “fuel” to supply it with energy. This is provided by the food we eat. But how much do we need to stay healthy?

The energy value of food is usually measured in calories(卡). A calorie is the amount of heat required to raise the temperature of 1 kg of water by 1℃. The number of calories people need per day is different, as the picture shows. Also, the number of calories you use at any one moment normally depends on the activity you are in. For example, you need more calories for standing than for sitting, more for running than for walking, and so on.

The energy in food is in the form of three kinds of chemical materials—carbohydrate(碳水化合物), protein(蛋白质) and fat. Carbohydrate provides 3.8 Cal /gm of the energy, protein 4.0 Cal/gm, and fat 8.8 Cal/gm. Each food contains different amounts of these materials, as the round pictures show.

(P= protein      C= carbohydrate    F=fat)

1.How many calories are needed to raise the temperature of 5kg of water from 35℃ to 90℃?

A.55.

B.175.

C.325.

D.275.

2.Which of the following contains the most amount of calories?

A.Milk.

B.Rice

C.Peanuts.

D.Milk or peanuts.

3.Who needs the most amount of calories each day?

A.A woman.

B.An office worker.

C.A farmer.

D.A boy aged 16.

4.Which of following is True?  

A.You need more calories for swimming than for mountain climbing.

B.A child aged 8 needs the same amount of calories every day as a man over 70 does.

C.A woman feeding baby needs over 4 times the amount of calories that a baby does.

D.Everyone needs the same amount of calories per day.

5.This passage mainly tells us ______.

A.all the energy is in food

B.the human body needs energy

C.the number of calories depends on your activity

D.we must only eat peanuts to get calories

 

When I was 16 years old, a boy gave me an important gift. It was a smile.

    It was the early autumn of my first year at a junior high school, and my old school was far away. As a result, no one knew who I was. I was very lonely, and afraid to make friends with anyone.

Every time I heard the other students talking and laughing, I felt my heart break. I couldn't talk about anyone with my problems. And I didn't want my parents to worry about me.

Then one day, my classmates talked happily with their friends, but I sat at my desk unhappily as usual. At that moment, a boy came into the classroom. I didn't know who he was. He passed me and then turned back. He looked at me, without a word, only a smile.

    Suddenly, I felt the touch of something bright and friendly. It made me feel happy, lively and warm.

    That smile changed my life. I started to talk with other students and made friends. Day by day, I became closer to everyone in my class. The boy with the lucky smile has become my best friend now.

   One day I asked him why he smiled, but he couldn't remember smiling at me!

    It doesn't matter because all the dark days have gone. I believe that the world is what you think it is. If you think it lonely, you might always be alone. So smile at the world and it will smile back.

11. Why was the smile an important gift?

A. Because the writer's old school was far away.

B. Because the writer didn't know who the boy was.

C. Because the smile didn't mean anything to the boy.

D. Because it made the writer feel happy, lively and warm.

12.The writer didn't talk to anyone in her new school about her problem because   .

A. she was always unhappy

B. she didn't have any friends there

C. she was in the first year at the junior high school

D. she didn't want her parents to worry about her

13. How did the smile change her life?

A. She started to make friends.

B. She became the best friend with the boy.

C. Her parents didn't worry about her any more.

D. She realized that she was lonely.

14. Where does she now think her feeling of unhappiness came from?

A. From her old school     B. From her parents.

C.. From herself.           D. From her classmates at the new school.

15. Who has become the writer’s best friend now?

   A. The writer herself            B. The writer’s parents

C. The writer’s classmates     D. The boy with the smile

 

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